Supersymmetric unification without low energy supersymmetry and signatures for fine-tuning at the LHC

By N. Arkani-Hamed, S. Dimopoulos. 2004

1,031 citations recorded by the source corpus.

The cosmological constant problem is a failure of naturalness and suggests that a fine-tuning mechanism is at work, which may also address the hierarchy problem. An example — supported by Weinberg's successful prediction of the cosmological constant — is the potentially vast landscape of vacua in string theory, where the existence of galaxies and atoms is promoted to a vacuum selection criterion. Then, low energy SUSY becomes unnecessary, and supersymmetry — if present in the fundamental theory — can be broken near the unification scale. All the scalars of the supersymmetric standard model become ultraheavy, except for a single finely tuned Higgs. Yet, the fermions of the supersymmetric standard model can remain light, protected by chiral symmetry, and account for the successful unification of gauge couplings. This framework removes all the difficulties of the SSM: the absence of a light Higgs and sparticles, dimension five proton decay, SUSY flavor and CP problems, and the cosmological gravitino and moduli problems. High-scale SUSY breaking raises the mass of the light Higgs to ~ 120−150 GeV. The gluino is strikingly long lived, and a measurement of its lifetime can determine the ultraheavy scalar mass scale. Measuring the four Yukawa couplings of the Higgs to the gauginos and higgsinos precisely tests for high-scale SUSY. These ideas, if confirmed, will demonstrate that supersymmetry is present but irrelevant for the hierarchy problem — just as it has been irrelevant for the cosmological constant problem — strongly suggesting the existence of a fine-tuning mechanism in nature.

Subfields: Atomic and Molecular Physics, and Optics, Nuclear and High Energy Physics, Political Science and International Relations

View Paper: https://www.semanticscholar.org/paper/b191141f981fb27ad553fc1b3557bf63ca5716fb

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Citations in the corpus

Search for New Physics with Atoms and Molecules (2017, background): “Glenday et al. (2008), Vasilakis et al. (2009), and Heckel et al. (2008) searched for the hypothetical ghost condensate resulting from spontaneous breaking of Lorentz symmetry (Arkani-Hamed et al., 2004; Arkani-Hamed et al., 2005).”
Dark Matter through the Higgs portal (2019, background): “the sfermion will decouple from the low energy spectrum and are integrated out [468–472].”
Natural tuning: towards a proof of concept (2013, background): “(Mini)split supersymmetry is a good example of predictive model building inspired by these considerations [7–10].”
Searches for heavy long-lived charged particles with the ATLAS detector in proton-proton collisions at s=8\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\odds (2014, background): “SUSY [16, 17], gauge-mediated SUSY breaking (GMSB) [18–25] and LeptoSUSY [26, 27], as well as other scenarios such as universal extra dimensions [28] and leptoquark exten-”
Distributions of nonsupersymmetric flux vacua (2004, background): “Although we foresee many applications of such results to string duality and phenomenology, a question of primary current interest is the likelihood to discover supersymmetry at the energy range 1TeV to be probed at LHC, perhaps as the traditional MSSM scenarios, “split supersymmetry” [2, 22], or per”
Sinks in the landscape, Boltzmann brains and the cosmological constant problem (2006, background): “The situation with the anthropic bounds on the amplitude of the Higgs field [86, 87, 88] is very similar.”
Chiral D-brane Models with Frozen Open String Moduli (2005, background): “In fact, the above argument is quite general, and is not limited to the specific mechanism of moduli stabilization/SUSY breaking.”
On Inflation in String Theory (2003, background): “The first and most striking example is that of the split supersymmetry [44] where the new ideas of supersymmetry breaking where consistently realized without a requirement that supersymmetry has to protect the smallness of the Higgs mass.”